Why is no one asking him what steps he will take to “take responsibility” for this?
Because he's a Democrat. DNC stands for "Dere's No Consequences".
The media will breathlessly report tonight how he stood in front of the cameras and 'took full responsibility,' and that becomes the template: Responsibility without consequences (for dems). He won't step down; he'll ratchet up the rhetoric. By the next election, his dumbass constituents will be lauding his courage and honesty for having stood up in front of the microphones and 'taken responsibility.'
He needs to put himself under the care of Bill Clinton